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use filter(|x| matches!(..)) instead of filter_map(|x| match x ... => Some(xy)) #90652

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merged 1 commit into from
Nov 9, 2021
Merged

use filter(|x| matches!(..)) instead of filter_map(|x| match x ... => Some(xy)) #90652

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28 changes: 8 additions & 20 deletions compiler/rustc_resolve/src/late/lifetimes.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -887,10 +887,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
let (lifetimes, binders): (FxIndexMap<hir::ParamName, Region>, Vec<_>) = c
.generic_params
.iter()
.filter_map(|param| match param.kind {
GenericParamKind::Lifetime { .. } => Some(param),
_ => None,
})
.filter(|param| matches!(param.kind, GenericParamKind::Lifetime { .. }))
.enumerate()
.map(|(late_bound_idx, param)| {
let pair = Region::late(late_bound_idx as u32, &self.tcx.hir(), param);
Expand Down Expand Up @@ -1370,9 +1367,8 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
let (lifetimes, binders): (FxIndexMap<hir::ParamName, Region>, Vec<_>) =
bound_generic_params
.iter()
.filter_map(|param| match param.kind {
GenericParamKind::Lifetime { .. } => Some(param),
_ => None,
.filter(|param| {
matches!(param.kind, GenericParamKind::Lifetime { .. })
})
.enumerate()
.map(|(late_bound_idx, param)| {
Comment on lines -1373 to 1374
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hrm, apparently rustfmt really prefers

.filter(|param| {
     matches!(param.kind, GenericParamKind::Lifetime { .. })
})

over

 .filter(|param| matches!(param.kind, GenericParamKind::Lifetime { .. }))

:/

Expand Down Expand Up @@ -1469,10 +1465,7 @@ impl<'a, 'tcx> Visitor<'tcx> for LifetimeContext<'a, 'tcx> {
let binders_iter = trait_ref
.bound_generic_params
.iter()
.filter_map(|param| match param.kind {
GenericParamKind::Lifetime { .. } => Some(param),
_ => None,
})
.filter(|param| matches!(param.kind, GenericParamKind::Lifetime { .. }))
.enumerate()
.map(|(late_bound_idx, param)| {
let pair = Region::late(
Expand Down Expand Up @@ -2237,19 +2230,14 @@ impl<'a, 'tcx> LifetimeContext<'a, 'tcx> {
let binders: Vec<_> = generics
.params
.iter()
.filter_map(|param| match param.kind {
GenericParamKind::Lifetime { .. }
if self.map.late_bound.contains(&param.hir_id) =>
{
Some(param)
}
_ => None,
.filter(|param| {
matches!(param.kind, GenericParamKind::Lifetime { .. })
&& self.map.late_bound.contains(&param.hir_id)
})
.enumerate()
.map(|(late_bound_idx, param)| {
let pair = Region::late(late_bound_idx as u32, &self.tcx.hir(), param);
let r = late_region_as_bound_region(self.tcx, &pair.1);
r
late_region_as_bound_region(self.tcx, &pair.1)
})
.collect();
self.map.late_bound_vars.insert(hir_id, binders);
Expand Down
8 changes: 4 additions & 4 deletions compiler/rustc_typeck/src/coherence/builtin.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -180,14 +180,14 @@ fn visit_implementation_of_dispatch_from_dyn(tcx: TyCtxt<'_>, impl_did: LocalDef

let coerced_fields = fields
.iter()
.filter_map(|field| {
.filter(|field| {
let ty_a = field.ty(tcx, substs_a);
let ty_b = field.ty(tcx, substs_b);

if let Ok(layout) = tcx.layout_of(param_env.and(ty_a)) {
if layout.is_zst() && layout.align.abi.bytes() == 1 {
// ignore ZST fields with alignment of 1 byte
return None;
return false;
}
}

Expand All @@ -204,11 +204,11 @@ fn visit_implementation_of_dispatch_from_dyn(tcx: TyCtxt<'_>, impl_did: LocalDef
))
.emit();

return None;
return false;
}
}

Some(field)
return true;
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Suggested change
return true;
true

})
.collect::<Vec<_>>();

Expand Down